So I am trying to add my neighbors across the street to my show. I bought 4 xbee modules and 4 of the xbee snap in assemblies from dirknerkles store. I have 3 houses in my show now, each running on its own serial port. I want to run the house across the street on its own port as well. What do I need to plug an xbee transmitter into a serial port? I don't want to run it off the end of an existing board, but directly from my com port. Couldn't find anything on dirknerkles store. Looked on the spark fun website, but I am not sure what I need.